Fact #3: Complete color blindness, where an individual sees just gray and black, is actually very rare.

Fact #4: Color blindness can passed on through genetics, but can also be caused by aging, retina damage or eye diseases.

Fact #5: In 1875, a railway accident caused by a color blind rail operator who read a sign incorrectly killed nine people. After this incident, color vision test were developed and used for railroad workers.

Fact #7: During WWII, color blind individuals were believed to have in advantage because of their inability to see the color green. This was believed to help them see through camouflage. However, today the military will not allow color blind individuals to serve.

Fact #8: Rabbits, dog and cats can see mostly gray shades. Bees and butterflies have superior color vision and are able to see hues that the human eye cannot perceive.

Fact #9: A rare condition, called unilateral dichromacy, occurs when a person has one normal seeing eye and color blind eye.

Fact #10: Individuals that suffer from red green color blindness may have trouble determining if their meat is cooked enough. The inability to see shades of red makes it difficult to tell.